Effect of temperature on the participation of NO2 in heterogeneous reaction to form sulfate particulate matter
Heterogeneous reactions of SO2/NO2 on the surface of α-Fe2O3 particles were investigated by in situ diffuse reflection Fourier transform spectroscopy.The influence of temperature on the formation of sulfate particles by NO2 participating in heterogeneous reactions was investigated.The results showed that characteristic peaks of sulfate(1259,1159,1069 cm-1)and nitrate(1603,1414,1335 cm-1)were formed on the surface of the particles.NO2 promoted the formation of sulfate from adsorbed SO2,while surface N2O4 was the key oxidant for sulfate formation.As the temperature increased from 253 K to 298 K,the reaction rate of heterogeneous reaction decreased by about 65%,and the initial uptake coefficient decreased from(4.88±0.07)×10-7 to(3.42±0.04)×10-7.The results showed that the temperature change exhibited a significant effect on the heterogeneous reaction of SO2/NO2 on the surface of α-Fe2O3 particles,α-Fe2O3 particles exhibited a greater uptake of SO2 at the initial stage of the reaction and at low temperature,which helped to explain the explosive growth of sulfate particles in winter.
NETL
NSTL
万方数据
